Problems communicating ATMEGA and ERA900TRS module

I am using an ATMEGA 328 PU connected to a LoRa module ERA900TRS for communication. The ATMEGA is connected to a multiplexer via I2C and the MUX is connected to multiple 3D sensors.

When the ATMEGA is on board an Arduino, I get data. However, the moment I try going bareboard, it doesn't send any data.

Did anyone have any similar situation?




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